A truly excellent Guarneri model. As opposed to many of the less costly variants out there it stabilises the instrument both in the direction of the neck and sideways, very good for those not using shoulder rest.
Only downside for me is that, like virtually all chin rests out there the feet of the rest are cut at a precise 90 degrees to the screws which does not correspond very well to the shape of the top of my violin but thanks to the high quality cork it stays solidly in place despite not having optimal contact.